Archived posting to the Leica Users Group, 1998/08/18

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Subject: RE: [Leica] Leica-Users List Digest V3 #251
From: "Jim Licquia" <licquia@earthlink.net>
Date: Tue, 18 Aug 1998 20:44:29 -0500

Dear Group,

I just read the following on the N_____ user group. Does anyone
agree/disagree with Mr. Covington's assertion the "nice bokeh" is really
uncorrected spherical aberation?

Jim Licquia

<<<<Date: Mon, 17 Aug 1998 09:59:42 -0400
From: "Michael A. Covington" <covington@mindspring.com>
Subject: Evaluating bokeh without film

You can easily evaluate the bokeh of a lens by looking at a very distant
point source of light, such as a very small electric light or the sun
glinting off a curved surface, and putting it out of focus.

Be warned, though, that the pursuit of pleasing bokeh can easily become a
Cult of Bad Lenses.  Pleasing bokeh generally comes from uncorrected
spherical aberration, which costs you sharpness.

Michael A. Covington  /  AI Center  /  The University of Georgia
http://www.ai.uga.edu/~mc  http://www.mindspring.com/~covington  >>>>>